Play 2.4及以上版本中的语言选择器斯卡拉2.11.6 [英] Language selector in Play 2.4 & Scala 2.11.6

问题描述

我正在尝试使用语言选择器和本地化消息来实现此简单页面:

I'm trying to implement this simple page with a language selector and a localized message:

| ... en ... |▼|

|...en...|▼|

理想情况下，当用户更改语言时，页面应重新加载，其中包含更新的消息和其他选择的语言

Ideally when the user changes the language the page should reload with an updated message and a different selected language

| .... fr .... |▼|

|....fr....|▼|

但是我无法使它正常工作:页面保持不变，唯一改变的是PLAY_LANG cookie.

but I can't get this to work: the page stays the same and the only thing that changes is the PLAY_LANG cookie.

控制器

package controllers

import javax.inject.Inject
import play.api.mvc._
import play.api.i18n._
import play.api.data._
import play.api.data.Forms._

class Test @Inject() (val messagesApi: MessagesApi) extends Controller with I18nSupport {
  def index = Action { implicit request =>
    Ok(views.html.test())
  }
  def changeLanguage() = Action { implicit request =>
    val referrer = request.headers.get(REFERER).getOrElse("/")
    val form = Form("language" -> nonEmptyText)
    form.bindFromRequest.fold(
      errors => BadRequest(referrer),
      language => Redirect(referrer).withLang(Lang(language))
    )
  }
}

模板

@()(implicit messages: Messages, lang: Lang)
@helper.form(action = routes.Test.changeLanguage()) {
    <select name="language" style="width: auto;"> onchange="this.form.submit()">
        @play.api.i18n.Lang.availables(play.api.Play.current).map { l =>
            <option value="@l.code" @(if(lang.code.startsWith(l.code)) "selected")>@l.code</option>
        }
    </select>
    <h1>@Messages("test.message")</h1>
}

任何帮助将不胜感激.

推荐答案

罪魁祸首是模板中的无意的额外>"符号:

The culprit was an unintentional extra ">" symbol inside the template:

                                            v
<select name="language" style="width: auto;"> onchange="this.form.submit()">
                                            ^

此错字没有产生任何错误，但阻止了server.side代码的执行.

This typo didn't generate any error but prevented the server.side code from being executed.

我应该注意到cookie不再更改了(它最初是在无法更改语言的代码起作用并且当我最终使其起作用时，我必须在模板内部引入了错字).

I should have noticed that the cookie didn't get changed anymore (it did initially when the language-changing code was not working and when I finally got it to work I must have introduced the typo inside the template).

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